Mirror of Broken Images still work? (H-Elegon)

Does the Tol Barad spell resistance trinket still work? I know they removed spell resistance from the game, but the trinket still shows it boosting resist, and I hear that it does indeed still reduce the respective magical damage.

I'm just wondering, since it may be useful for heroic Elegon, where some raid members must take massive arcane damage from annihilation.

Etc etc. A shame stamina is so good and mastery utterly useless for that fight (I reforged it to crit in fact), because the trinket still kick ass for 100% magic figths. 2 years and the trinket it's still good, best rep grind ever.